Miniaturized, wireless multi-channel potentiostat platform for wearable sensing and monitoring applications

A miniaturized potentiostat integrated with a three-electrode system to monitor different analytes is presented. The potentiostat circuit has been designed to have the feature of four-channel multiplexing to operate different electrochemical cells simultaneously. It is Bluetooth-connected to a user-controlled mobile app through which the system is wirelessly controlled and data is acquired. The personalized data from the analysis are displayed and analyzed in the mobile app. The system is comprised of four units: digital to analog converter (DAC), multiplexing unit, control unit, and current to voltage converter (CVC). The circuit is run by Arduino NANO 33 BLE. The Arduino's digital pulse width modulator (PWM) signal is converted into an analog signal through the DAC unit to run the scanning in the voltage range of -1V to 2V. This output of the DAC unit is then fed into the multiplexing unit to distribute it to all four control units one at a time. Later, each control unit of the respective cells performs scanning through the three-electrode system connected to the control unit. The real-time scanning data collected from the cell, sent to the CVC unit, and converted into a voltage to be readable by the Arduino. With its small form factor, low power, and low cost the presented system can be used wearable health monitoring platforms.